hrtimer: convert kvm to the new hrtimer apis

In order to be able to do range hrtimers we need to use accessor functions
to the "expire" member of the hrtimer struct.
This patch converts KVM to these accessors.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
diff --git a/arch/x86/kvm/i8254.c b/arch/x86/kvm/i8254.c
index c0f7872..1bf8f57 100644
--- a/arch/x86/kvm/i8254.c
+++ b/arch/x86/kvm/i8254.c
@@ -205,8 +205,8 @@
 		wake_up_interruptible(&vcpu0->wq);
 	}
 
-	pt->timer.expires = ktime_add_ns(pt->timer.expires, pt->period);
-	pt->scheduled = ktime_to_ns(pt->timer.expires);
+	hrtimer_add_expires_ns(&pt->timer, pt->period);
+	pt->scheduled = ktime_to_ns(hrtimer_get_expires(&pt->timer));
 
 	return (pt->period == 0 ? 0 : 1);
 }
@@ -246,7 +246,7 @@
 
 	timer = &pit->pit_state.pit_timer.timer;
 	if (hrtimer_cancel(timer))
-		hrtimer_start(timer, timer->expires, HRTIMER_MODE_ABS);
+		hrtimer_start_expires(timer, HRTIMER_MODE_ABS);
 }
 
 static void destroy_pit_timer(struct kvm_kpit_timer *pt)